The district courts of the United States, the United States courts of any territory, and the United States District Court for the District of Columbia shall have jurisdiction under this chapter and, concurrent with State courts, of actions at law or in equity brought under this chapter without regard to the amount in controversy. Any such action may be brought in the district wherein the defendant is found or is an inhabitant or transacts business, or in the district where the sale took place, and process in such cases may be served in other districts of which the defendant is an inhabitant or wherever the defendant may be found. No case arising under this chapter and brought in any State court of competent jurisdiction shall be removed to any court of the United States, except where any officer or employee of the United States in his official capacity is a party.